US2937223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vent plug
Assignee: Richardson Co
•
Filing: 1958-05-05
•
Granted: 1960-05-17
•
Expires: 1978-05-05
Abstract
No abstract record available.
Inventors
- 👤 Allen F Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:28
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/308; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1166102A
Cited
GB166186A
Cited
US1426966A
Cited
US1907911A
Cited
GB464282A
Cited
GB551888A
Cited
US2658100A
Cited
GB546943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |